Fossils help to show us how organisms have changed over time, but there are gaps in the fossil record due to soft tissue decay

The biggest evidence for evolution that we have is the pentadactyl limb which indicates that all invertebrates with this shared a common ancestor

Growth

You can observe human growth through percentile charts

Plants grow through elongation of cells, they change and specialise according to needs, animal cells are the same.

Blood

Blood contains: White blood cells, containing antibodies to kill pathogens, Red blood cells, containing haemoglobin, plasma, making up the majority of the blood and platelets which help the blood to clot

The Heart

Pumps blood around the body, receives deoxygenated blood on the right side and oxygenated blood on the left side, the left ventricle is the biggest chamber

The Circulatory System

Made up of the heart and the blood vessels of the body, arteries, veins and capillaries, arteries take blood from the heart, veins take blood to it, one of the main organ systems

The Digestive System

Made up of: Mouth, Oesophagus, Stomach, Small Intestine, Pancreas, Large Intestine, Anus, Liver and Gall Bladder

Breaking Down Food

Amylase digests carbohydratesinto sugars and starch, Pepsin is a protease that digests protein into amino acids, Lipases digest fats into fatty acids and glycerol, bile from liver emulsifies the fats

Villi

Villi absorb the good molecules from food from the small intestine into the blood, steep concentration gradient makes the process quicker